build(deps): bump redis from 5.2.0 to 5.2.1 in /server

Bumps [redis](https://github.com/redis/redis-py) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v5.2.0...v5.2.1)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

server/requirements.txt

@@ -1,6 +1,6 @@
 rq==2.0.0
 click==8.1.7
-redis==5.2.0
+redis==5.2.1
 pyyaml==6.0.1;python_version<"3.8"
 pyyaml==6.0.2;python_version>="3.8"
 jsonschema==4.17.3;python_version<"3.8"